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Kernel: Use Processor::wait_check in loops waiting for HW to respond

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This gives the processor the hint that it is in a hot loop and allows us
to do other work in between
This commit is contained in:
Hendiadyoin1 2023-09-12 14:58:55 +02:00 • committed by Andrew Kaster
parent cbaa3465a8
commit a2810d3cf8
9 changed files with 31 additions and 36 deletions
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4
Kernel/Arch/aarch64/RPi/Mailbox.cpp
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@ -64,13 +64,13 @@ static void wait_until_we_can_write(MMIO& mmio)
// Since nothing else writes to the mailbox, this wait is mostly cargo-culted.
// Most baremetal tutorials on the internet query MBOX_READ_STATUS here, which I think is incorrect and only works because this wait really isn't needed.
while (mmio.read(MBOX_WRITE_STATUS) & MBOX_FULL)
;
Processor::wait_check();
}
static void wait_for_reply(MMIO& mmio)
{
while (mmio.read(MBOX_READ_STATUS) & MBOX_EMPTY)
;
Processor::wait_check();
}
bool Mailbox::send_queue(void* queue, u32 queue_size) const